After making his South Park debut last fall, Marc Jacobs and the creators of South Park are working together again—and this time, it's official. Available now are a set of “Skin” T-shirts featuring South Park characters Cartman, Butters, and Randy stripping down naked for a good cause. All proceeds from the T-shirt sales will go to the NYU Skin Cancer Institute. Visit the Marc Jacobs website to purchase one for $35. [marcjacobs]